This Small Lava rock is commonly used in bonsai soil mix to prevent compaction. The smaller lava rock is a traditional ingredient added to Bonsai soil mixes. Lava rock will not break down over time. It is non toxic and completely reusable which makes it an ideal component for soil mixes. The porous structure of the lava rock also allows for water retention. Ideal for junipers and pines.
- Amount: 3 Dry Qt
- Ingredients: Black Bonsai Grade Lava Rock. Fills approximately 8-10" bonsai pot.

This in my opinion is a great buy, it is very good for roots. I would say it allows them to be more stable and has great ability to hold water when need be but also drain as needed. Best thing about it is you can use it on its own and there is no need to mix in anything.

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4 of 4 people found the following review helpful:

great mixing component

April 24, 2013

Reviewer:
Jessie from Salt Lake City, UT

I chose this instead of a larger size b/c my tree is still small but it seems to work great. I have used lava before for repotting in not only my bonsai but othe plants and it works great for water retention. It as well helps to let me know when the plant is getting dry because the lava has a different color slightly when wet vs dry.